Rust and C optimization level don't match.

[yzhang71]

From the Makefile, I saw C server is compiled with optimization level -O3, but Rust is compiled with -O, which is equivalent to -O2.

[jonhoo]

Oh, that's a good point! In practice though I doubt it makes much of a difference for these benchmarks since they're much more focused on the I/O stack where -O3 vs -O2 should mostly just be lost in the noise.